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Method for preparing alpha-semi-hydrated gypsum by utilizing azo dye sulfuric acid wastewater
The invention belongs to the technical field of inorganic functional material preparation, and relates to a method for preparing alpha-semi-hydrated gypsum by utilizing azo dye sulfuric acid wastewater. The method comprises the following steps: (1) stirring the azo dye sulfuric acid wastewater and a calcium-containing compound at normal temperature, and filtering to obtain brown crude gypsum; (2) preparing the brown crude gypsum into slurry by using deionized water according to a certain proportion, and adjusting the pH value of the slurry; (3) pouring the slurry with the adjusted pH value into a reaction kettle, setting the reaction temperature, introducing ozone, and reacting until the color of the slurry reaches white; and (4) after the reaction is finished, filtering, drying, naturally cooling, and grinding to obtain the alpha-semi-hydrated gypsum. The method has a good treatment effect on high-chroma industrial dye sulfuric acid wastewater, meanwhile, high-concentration COD in the wastewater can be effectively reduced, high-quality white alpha-semi-hydrated gypsum can be obtained, and the method has the advantages that the application range is wide, reaction conditions are mild, production equipment is simple, and the prepared alpha-semi-hydrated gypsum is high in quality, good in performance and the like.
本发明属于无机功能材料制备的技术领域，涉及一种利用偶氮染料硫酸废水制备α‑半水石膏的方法：(1)先将偶氮染料硫酸废水、含钙化合物常温搅拌，过滤，得到褐色粗品石膏；(2)再将褐色粗品石膏用去离子水，按一定比例制成料浆，并调节料浆的pH值；(3)将调好pH值的料浆倒入反应釜中，设置反应温度，通入臭氧，反应至料浆颜色达到白色；(4)反应结束后，过滤烘干，自然冷却降温，研磨后得到α半水石膏。本发明对高色度的工业染料硫酸废水有较好的处理效果，同时可以有效降低废水中高浓度COD，且也可以得到高质量的白色α‑半水石膏，具有适用范围广、反应条件温和，生产设备简单、且制备出的α‑半水石膏品质高，性能好等优点。
Method for preparing alpha-semi-hydrated gypsum by utilizing azo dye sulfuric acid wastewater
The invention belongs to the technical field of inorganic functional material preparation, and relates to a method for preparing alpha-semi-hydrated gypsum by utilizing azo dye sulfuric acid wastewater. The method comprises the following steps: (1) stirring the azo dye sulfuric acid wastewater and a calcium-containing compound at normal temperature, and filtering to obtain brown crude gypsum; (2) preparing the brown crude gypsum into slurry by using deionized water according to a certain proportion, and adjusting the pH value of the slurry; (3) pouring the slurry with the adjusted pH value into a reaction kettle, setting the reaction temperature, introducing ozone, and reacting until the color of the slurry reaches white; and (4) after the reaction is finished, filtering, drying, naturally cooling, and grinding to obtain the alpha-semi-hydrated gypsum. The method has a good treatment effect on high-chroma industrial dye sulfuric acid wastewater, meanwhile, high-concentration COD in the wastewater can be effectively reduced, high-quality white alpha-semi-hydrated gypsum can be obtained, and the method has the advantages that the application range is wide, reaction conditions are mild, production equipment is simple, and the prepared alpha-semi-hydrated gypsum is high in quality, good in performance and the like.
本发明属于无机功能材料制备的技术领域，涉及一种利用偶氮染料硫酸废水制备α‑半水石膏的方法：(1)先将偶氮染料硫酸废水、含钙化合物常温搅拌，过滤，得到褐色粗品石膏；(2)再将褐色粗品石膏用去离子水，按一定比例制成料浆，并调节料浆的pH值；(3)将调好pH值的料浆倒入反应釜中，设置反应温度，通入臭氧，反应至料浆颜色达到白色；(4)反应结束后，过滤烘干，自然冷却降温，研磨后得到α半水石膏。本发明对高色度的工业染料硫酸废水有较好的处理效果，同时可以有效降低废水中高浓度COD，且也可以得到高质量的白色α‑半水石膏，具有适用范围广、反应条件温和，生产设备简单、且制备出的α‑半水石膏品质高，性能好等优点。
Method for preparing alpha-semi-hydrated gypsum by utilizing azo dye sulfuric acid wastewater
一种利用偶氮染料硫酸废水制备α-半水石膏的方法
CHEN SHIQI (author) / ZHANG YUE (author) / MA XIAOMING (author) / LIU JIANWU (author) / YAN SHENGHU (author) / XU CHENG (author)
2022-12-16
Patent
Electronic Resource
Chinese
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